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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a1a60476565df0352ef971caa64e9056a6f985f3ce731d1e91a41239b76fe51' 
  AND token = '8nTGnA2EtkOzHSQYK1w10g4DWNg1hYpf8JgSl62gpqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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