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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f2aaf1ad5270f0211dfcc60009908df32c3e72e8914a159078aa03c7ca0a5e' 
  AND token = '9kVWC3FLri74GB7IxK1M0vtq21v1/6F8yTInHk+06Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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