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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90620f8a91d8223b90f5760a0e3c03b91cab2e463a58f9c0d4419c551ee8133a' 
  AND token = 'HZTF14tAY1VBR/TJlmssyUD/X88lFzgQM4q2l2uiCXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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