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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a90a6c252bd47b42b0876f7034e75eba0e1ac49b5757d262c0fcf596d8440c7' 
  AND token = '1XfgLIKd0TYgYh7BkF3dQEpp9/4kpr1Nlp0E/Y+3Zqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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