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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1d7be310ed39c1f5fe1c12bfa2b7c39bbba7150ff08e84e5c6e3d445f38c0e3' 
  AND token = '7EGZvkEG/TaSgTXiuk827LYW04k6E6pAozKxJ84Er3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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