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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1aa981cf1d76f84b810448001f56e2cfe7abd82bb73b3f824a8840085e9bc7' 
  AND token = 'Vg5XBD3wzoA0H6nCcMT91xzBq+5NOsK4LnRWmQ+ONDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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