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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94776ed1cd25efe4e5f3aa623fbb9a1004296fc79b1119600f0f7fb100d97502' 
  AND token = 'szt1sQgLtjjaaqrYSFYrixlfTytdb1AMNUNgZRXtkWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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