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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8953cfd66a30127a97407d403c564e281a668457e49b9a741bc271ca0c7babd7' 
  AND token = 'b/ibS3I24MwapMHYPbn7GOoopK38TXxWGDltuORxb+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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