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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ebbd587af05384e72441459fcfde48e4034f48572d27d8f9667eb120aa2b17' 
  AND token = 'QVrakRbBhCmyjdlBABPtaTEH/4Y6dcA62qJFE+7CXkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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