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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881a0a664a54c530598823615b8d4fb68b6884ede7cd3a51f7def4fef05fec11' 
  AND token = 'WI6jEzD5byW/KpUVksVO6c99OxJWyjjQjWgkFp6BUg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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