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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19cf4f39e22a6409c5c83256e5f3964daf0a824bf8fd87ef43dbf5656f6bea9' 
  AND token = 'mV35QnxpiOJ6A8f8BEqRF5MUuQXfY0wgTmVkNPhDGIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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