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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e7491c4fee0a2a790ea3e01b9bf1272956be98422f79c066af9cab37bd77ac7' 
  AND token = 'LCCmseF7nP0Te7ohxCldkernB8PQJFxbUwNfIpnQ4RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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