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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbbe374137e190df7c748c508d70dc719d16ebfcf0c2994481c76a662c9e2c34' 
  AND token = 'WCngrHfptPOlnFlTU++RNt1QG+Ag9yafPx9NKllFqIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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