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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6626673b61a3585700ef06d29a39f4cf32b93339db7a6723bff153efb0902a08' 
  AND token = 'olvi4Y9lYtvOclAU5VnnehW9bWhlWNRgTcGZbJOyEAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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