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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '763df4de6704e42b0e910476f532925ceadb17eee658ec0a590baaa00cbdefda' 
  AND token = 'BMk0dfPd6owCmFA9Bvj1N9Cri31KniEWZ7l3272v/7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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