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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba7d6f0c90ab5854d213c7672ce66e5b2db5d918fb9dfc7f33cdcc5b0fea29a' 
  AND token = '0QPAa8kt98fxbMSAn/PbEGqz3vFk2Aohko46YTrekek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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