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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68d0f8ed568468da0a7ce33c559f806c056609087a32a0a9abd39904c4d899c4' 
  AND token = '60unH4hIPSP7NI3OwqemCojuZ0zrIIaNbyFCeR2CRzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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