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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c4d65845a88ec293e4706e94a4f9073d76b9a6cb83f31c860ea47472b5563e' 
  AND token = 'CXOIvnEOjo1Wu9MHNvx3dAIRJC5Ra+cOCZtN+VJNZCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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