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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7baaae4fe76f07a5cc64a3da19027c4f075db1b658812ef9c121b4926f1fb18a' 
  AND token = 'jpqmRe6iJgtZInv3mcdvuPZ8Sif3Gkeijv1yPAU8Ue0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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