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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb4604343c1a90797c847662e354cbca8422667fe232951003ee7533969c1ac' 
  AND token = 'sXWL48FD7ddV/Cpog35x1taif/zFt5ow8gAG7rZ7w6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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