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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a30401b4e4a82df6c9fdec3faab245c0a0edbd9f9282acee251daf92ba8b4e4' 
  AND token = 'IMJWwlaF7eXGdAjujKNU5a+khrdQms9CxB+aCopHYvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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