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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '381c923db8a2a14abc64fbba22b5acd14d33b790fbd295e06be659c2071242d9' 
  AND token = 'gY5i0hP6LgLVYX+uiQVWS/qtCPy0eBDlAoSrZOrQ6D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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