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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d0a5ffad8e8d59f765050794f2cf963ff04e53934e5af62b59acf8a7fe3001' 
  AND token = 'rj1F/Mji0RtJSazaOeN4RDvh3M+e4WY7BohYWR/3p+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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