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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619cec4bb8336f4caf586f778a0f222e2e4fbd6576ea7d3c7d997db65ea9171b' 
  AND token = 'AHa7KXqlEaIAyAkS8y7fcIWFdI2xGSEX8FiDTSg+XzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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