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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fdbabca1b9ceaddee89e3e5b072b00b968423ef1fe19c7530b6846cba2d240' 
  AND token = '3AEUdiy6pL6oF/eSL2jTa3dz3tb3mLn4x5vzjtTCXzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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