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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dfeb6f0e3fa4094d1132ecea4cafb1ad1d37d8ca3cd44a32c5301b22c42b60' 
  AND token = 'spoGfVdtO2qHcCiWJzqzJUiXl3Z3G0K7Lxt0T5enQAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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