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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8cbccc567bdd155a0a7391bd94a3c83fe243a974997b2d1d6420b391b6e75a5' 
  AND token = '2TnAdxYqqKUl/2/4adgX3BeWRNuELi0jDxZcw2/BN68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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