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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db9c9c8d713a960acc63c1d398c2e1bf6aa453caea047825dde777c53d98abea' 
  AND token = '4yr3vKJ8scn4rhSy+709i0VA1gtAfnvm4GbB1Fy08hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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