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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6967939bce834e5988827cce247c82f67a86b78955f1f2f4d485c0969d1de2cf' 
  AND token = '2XELqRK2Ige3SLSVO2LSJsVcrkYApq6JWGoE9QwZxe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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