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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92552c5fedd93739011ae723e4b4b2d166d0405f2a4b9431fe108f967ecadf3c' 
  AND token = '4iTtf7kpvfvfIApCPsIKgf2MprEJhLnyM2jCNW5pWG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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