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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805c62c688032c7efa624ecdb2b2d5d8aee8edc7b9a55cba872ee58261ab6816' 
  AND token = 'zIFi5agntSTwVIBxQk6nnxeR+siMmRFcrlImTn+kaXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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