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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0764ff8a3de362e110ea791cbf2b6953c4c26575ea63d826ce1a161e2634184' 
  AND token = 'dr1kxlnMXn76bT//hbfCJK8sGO8lazs/ZU5idRp84GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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