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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83038e7377b8ee48bbb12c474378aeb252e1fe500a85439d286b437afdbae13' 
  AND token = 'tYR1z8fzfq1umao5FZVxwS+LegGlxI2IqAOWo2Lh+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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