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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953c17781a3bf052d90b60b6bfda7bdf7a1ca18cc353ba7c7652c523c9455277' 
  AND token = 'd/dHGTzveFUzV5k5fVa3BKst4yyE2Tt8h0K4ELfIcUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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