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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49776ab75be8658fe5161fa37c7d47740b42abdd6bff9563ee931485acd2ffbf' 
  AND token = 'vXCyMpm6+uJc3Nugyd1eTjFqr/eiK5paMNQnlOG8W6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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