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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141fc1865967e49b8c1e431340d74f6f5c9a6df925ff59950f1416f62c99688b' 
  AND token = 'FEKEoDB8w3VRoABQyj3046p46PN66bHKPdElcYdLArc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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