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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a886418e67d617f8fa30b2b9793ee2c25ee1c9fae0103fa7ca844ec88d309c' 
  AND token = '/gnsBbIEhj8g3bHv19KlIM4sCv4eG4J0QbBNe12UisE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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