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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa20a4c431dee6c0f4acbea76627b8e4bb48e692465df5c11fb47bc0bbefc4f' 
  AND token = 'MS88U9Qrx9Snwp1tx0SpbyiPp19cFC49RFELeBdAGAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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