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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d13cecef871562d6c3790b39d1d6dcfc09ded85a7d3b027177270e09e1383f1' 
  AND token = 'b0NJEDpDCqZ10zV4A3d9biGh1KqEjz2pS+A/4RygAJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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