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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ba343f7edfdcfbc913d53ca437531c2ee33fe7617f791c42235fb1a2ab33d9' 
  AND token = 'f+vPzrH1tc92OeZJZkU4Y7F/823U/ulf3AvKinyIQd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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