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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4a32943f6e922f16a7d70813228d78924a383bf54a4d189919f95577948696' 
  AND token = 't5QEYeo6ZjsX/2U8hx9AZdSXd5JaSV38VsMn67p+AOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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