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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbad1aa0725f226c0b552842cd464393be6822db53f6998e7b8fab2320b65212' 
  AND token = 'uhQbVj7Vz13eANcKx8/Wu+fH73wH1HqfYkcgsj5t2Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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