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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2642957f38ea7d0cde3ab3e07cc45070f385e295c8f1a0103705163abdcc02' 
  AND token = 'ltbvmR3FS/JqRuk+zgfyeKqvxMuwZ/89gtpTdquxS0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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