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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123f3c81d0de9895f8cbcf8f3bd996e169052e132d94c0028b89385bc40b43df' 
  AND token = 'cjmJO0O4+u0fJxQCo2/cJAQR9ynbnHyNIMN6g92fapQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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