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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e5d044cb890eb2c74f87a9cd2a46a3d6dc1cc892ff3315a23e6605e3d576ac' 
  AND token = 'BrPLPyEEcS38fA688V63wMPXUaPCpHHr6lITsOvYPvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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