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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4ba4540612373ee16fd35d30a64b047a3b6d83dcc8cc9f14bd401e35d059fe6' 
  AND token = 'UdlvfBO90yzWeriCTWSDFjmSoppAGBUoa48qHi8sKqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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