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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c06441ec5056675051e01db2802c0aa33b8c1933cce6bedba41d32fb1938e2' 
  AND token = '2w/V/ehZBPhTQb7UtiLiYsdLRLQieXqFvCe2yo2EnDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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