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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d4c6e372835ed3f726816fd21bdb4fb05c531a32b2d5260ba8f87cc93c3b2f' 
  AND token = '82l2H9zOYRVcpcMySshOn6nH2fTDD2b73qkACBJgH4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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