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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95668b51a12ace27f15b106d21eb32748f584e836f6cb7bbc30216accc391116' 
  AND token = 'jCHs3VAKAPjgPvG0F8I1riVAF/sJKovJfMX91fS6ztg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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