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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d9ff77dfee272f92a693ec1bbc9d01debb19d5ce4a21e299aeb544246de2e3a' 
  AND token = '0+IOlHQPqnr/+COYaGFiv45SymYJSCLxpmQcJgSuMas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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