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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ece57683bcb50f7246c4f2c6a1b5971c22aa9570e817d5518c7f675bae4064' 
  AND token = 'uGM8IbQ/UclRpQ4w6JKcP1L5TLp6mDSTb296lTpTodc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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