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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c1db28fa11a8d62e47e9ee8f8ae336d680acd435f307f4dcdc1619806066ac' 
  AND token = 'zp6p/OdzKzsmyNOP+kQo1iLCtXBIrbH00u8vaiPEus8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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