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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f890d51f5cc610687e24eeddb47c3b09dc93c20158ff51ea43dcf17dc039ae' 
  AND token = 'Gfe0plKRZ/lY5a/tgSlAUM8GWI9dwPuo5+f3mBQxObQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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