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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bbeb5e9a8f51368c95600038dbea3d388a6635e14525a1fc566642d9a819e9e' 
  AND token = 'IF54iItF9Eb5l0fayPtImxAv5TXLnHfImfYD7u5b4+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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