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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2224254adf3e72e48bb213cf6a527e4e631a1bfccfd42cc708c5b0dcf1bb4994' 
  AND token = 'pToNivm/OkcRpG+I+cJ88zoLUY3gZJ9vffGT+k5OC+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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