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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da08dac399481efbef7f057019d288e9e637e0b75d0596008d3619e8392d31d' 
  AND token = 'lbqrQrZCZjGnFlUZFskOmU8uHSjHZz2UgiZM5+mgRos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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