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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02faaa00263ddfc030c0d1fc7f19d42d654700085ef96b294f7adc50073b6a4a' 
  AND token = 'UDfd0E6KyxmFABnwdpaG1/c4p/9vsgegZwxvcz5EZl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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