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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a33512d087c5e6e69e40ea56b632915e3fddc6a9943a8b7eebd8df5e6e1508' 
  AND token = '1SoaLrzZ60a5lt1BAxte3tGlEmfw8wN6BKEusJG+KL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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