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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d15ec8144814946187bb1c6ae85b1ad066de8fc3f30f25eddaac6f88f810b06' 
  AND token = '4t2ps4bZUIzbT0TaoKI5q1PZUuA56w+bSxqIWXa9lLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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