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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '019b528e13b75b538a1efb7696a87cb96724181fb47600a0cfa970fface93229' 
  AND token = 'RunZkpfmYBoYnVmrGvsNzQYic9bovb2zIdGDCkmbVXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}