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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a0ed3df8d5358870f7a4c6f8b902f6c03ff4113a7fa4810e7e18123f9b468d' 
  AND token = '6lZ0bcC7JtWwW+Ypu34Fj4+aF8BZg4ZYM59iYNibwuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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