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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8eb8f439774c425f97e001ffc1c84c9d1a482f4d5cb7d35f2bac83a8c551cd5' 
  AND token = 'PgQDTKGbDv/QLbNbEMwME1tOlbMVUM93J+aLc67u5KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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