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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0df4c1f721ddd9ec5b9c04dc1694a53aef0c02ad390a4e503d69237597c50e' 
  AND token = 'SXEwTGR2lTSBNSIb4/gUJG+QMrwmiNbZBjYxyq+fcZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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